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Fair Value Measurements - Carrying Amounts and Fair Values of Financial Instruments (Parenthetical) (Detail) | Mar. 31, 2020 | Jan. 31, 2020 | Dec. 31, 2019
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5.75% Senior Notes Due 2021 |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Interest rate on notes | 5.75% | 5.75% | 5.75%
5.00% Senior Notes Due 2022 |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Interest rate on notes | 5.00% |  | 5.00%
5.875% Senior Notes Due 2022 |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Interest rate on notes | 5.875% | 5.875% | 5.875%
5.00% Senior Notes Due 2023 |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Interest rate on notes | 5.00% |  | 5.00%
4.875% Senior Notes Due 2025 |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Interest rate on notes | 4.875% |  | 4.875%
9.25% Senior Notes Due 2026 |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Interest rate on notes | 9.25% | 9.25% |
5.75% Senior Subordinated Notes Due 2021 |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Interest rate on notes | 5.75% |  | 5.75%
5.00% Senior Subordinated Notes Due 2022 |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Interest rate on notes | 5.00% |  | 5.00%
5.00% Senior Subordinated Notes Due 2023 |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Interest rate on notes | 5.00% |  | 5.00%

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